Oxazine diones



[details and embodiments are described.

Patented July 19, 1949 UNITED STAT PATENT OFFICE 'Paul fNawiasky, Summit, and Leslie Millard 'ISchenck, 'We's'tfield, N. ,J., and Isaac ,Glenn Stevenson, Binghainton', N. Y assignors to j General Aniline &;Film Corporation, New York, N. 'Y.',-a corporation of Delaware No 'DraWing Applic'ationOctober 1', 1-946, Serial No. 700,388

droxy acid and a primary aromatic amine as described in United States Patents 2,324,832'and 2,357,395. It has been observed in actual practice, that these condensation products have a tendencyitoi-mpair the optical sensitizing propenties' of the dyes whichare used in sensitizing the emulsion. in the "red sensitive layer. Moreover, these condensation products do not always produce' upon color development a dye image of satisfactory color density 'and purity. These results are due primarily to the impurities retained by. the condensation products after their isolation.

It is an object of the present invention to provide a process of puriiyingaromatic l-hydroigy-2-r acid amides by converting them into aromatic oxazine diones.

It is a further object to purify aromatic "l-h-ydroxy-Z-acid amides by converting them into aromatic oxazine diones and reconverting the diones to the-amides'by hydrolysis. I A furtherohject'is ito purify aromatic l-hy- 'droxy fl-acid amides by .iconverting them into aromatic oxazineidiones and reconvertin the diones to the amides hy'hydrolysis with an alkali.

A further object is to purify aromatic l-hydroxy-Z-acid amides by converting them into 1 8 Claims. (01. etc-244) aromatic oxazine diones and rec o'nverting the diones to the amides by: hydrolysis with an alkali and removing the oxazine diones from the reaction mixture. 1

Another object of the present invention-is to provide a process of purifying aromatic l-h'ydroxy-2-acid amides by converting them into aromatic oxazine diones, which -u-pon hydrolysis in an alkaline mediumprior to incorporation into a silver-halide emulsion la-yeror .in an alkaline.

developer, yield aromatic 1 -hydroxy 2 acid amides of the highest purity. I I

A still further object of the present invention is "new aromatic oxa'zi-ne diones capableiipon Fhylr'olysis' of yielding aromatic *I- hy-droXy 'Z-acid amide I 1 I -Other objects wi-ll beapparenfibyreferenceto the" following 'sjpecificaftionfinwhijchf'lts preferred Il hejabove objects are accomplished by heating, inthe presence" of a" s'olvent-d'ilu'ent containing an acid acceptor; a compound of the following ,gene'raliormula in order to "effect ring closure fthereof with elimination of an alcohol. I-n the above formula R' i-s' an alkyl group, e. g., methyl, ethyl,"propyl, isop owl; utyi nathe mam repre ents an anphatichydrocarbon radical of from 5 to 18 caralkyl .group, as'above, or the atoms necessary to completea naphthyl or anthryl ring structure, and X represents either hydrogen, a halogen, e. g., chlorine, bromine, or iodine, or an acid radical, e. g., sulfonic, carboxylicIp -toluene sulfonic, and the like. Theresulting oxazine diones are then isolated from the reaction mixture and are char-' acterized by a structure corresponding to the general formula: V

wherein R1,"R2, R3, and X have the same values as'given above. These products upon ihydrolysis in an alkaline solution, yieldearomatic l-hydroxy-2-acid amides of the highest purity and of the following general formula:

' R'CONH-A wherein R is a hydroxy aryl radical and A is an aliphatic radical of at least 5 carbon atoms, an aryl radical or a heterocyclic radical of the same value as R1. Said aryl radical may be substituted by an acid group, at least one aliphatic straight chain hydrocarbon carrying from 5 to 18 carbon atoms, and an amino group carrying a radical V capable of rendering said products fast to diffusion. Said amides have particular value when used as cyan color-formers.

According to the present invention, the arcmatic oxazine diones represented by general Formula 2 can be readily prepared by a number of methods. For example, one mol of a compound of the type represented by general Formula 3 is heated with one mol of an alkyl chlorocarbonate, e. g., methyl chlorocarbonate, ethyl chlorocarbonate, n-propyl chlorocarbonate, butyl chloro- I carbonate, amyl chlorocarbonate, isoamyl chlorocarbonate, and the like, in the presence of a solvent-diluent which is itself. an acid acceptor or contains an acid acceptor, e. g., a tertiary nitrogenous' base, such as trimethylamine, triethylamine, tributylamine, pyridine, dimethyl pyridine, ethyl pyridine, trimethyl pyridine, ethylmethyl pyridine, and propyl pyridine, or quinoline and derivatives thereof, e. g., benzoquinoline and pyridoquinoline, preferably at reflux temperature for a period of time ranging from one-half to tWo hours, removing the solvent-dilutent at re- '9 duced pressure in order to obtain a precipitate which is dissolved with Warming in an organic solvent, i. e., an alcohol such as, methyl or ethyl alcohol. Upon cooling to room temperature, the precipitate is filtered oil and recrystallized from alcohol. With l-hydroxy-N-octadecyl 2 naphthamide-l-sulfonic acid in the form of its pyridine salt, ethyl chlorocarbonate, and pyridine as a solvent-diluent, the reactions involved may be illustrated as follows: 0

O t O- O C2115 N.HC1

(n4; ONHOm a'l O SOQELQsHAN Another method consists of reacting one mol of an aromatic 1-hydroxy-2-carboxylic acid with 76 one mol of an alkyl chlorocarbonate in the presence of a solvent-diluent to obtain an aromatic 1-carbalkoxyoxy-2-carboxylic acid. The carboxylic acid group of this compound is then reacted with thionyl chloride (S0012) so as to convert the carboxy'lic acid group into a carboxylic acid chloride group. One mol of the resulting aromatic 1-carbalkoxyoxy-2-carboxylic acid chloride in the presence of a solvent-diluent is then reacted at a temperature ranging from 0 C. to 30 C., with an aliphatic amine of at least 5 car bon atoms, an aromatic amine or a heterocyc-lic amine to give a product represented by general Formula 1. At this stage of the reaction the reaction mixture is refluxed at a temperature ranging from C. to C., for a period of time ranging from one-half to two hours. The solventdiluent is removed at reduced pressure in order to obtain a precipitate; which is dissolved with warming in alcohol and then cooled to room temperature. After cooling, the precipitate is filtered off and recrystallized from alcohol. With l-hydroxy-2-naphthoic acid, ethyl chlorocarbonate, thionyl chloride, aniline, and pyridine as a solvent-diluent, the series of reactions involved may be illustrated as follows:

(a) OH 0 /N\ O O--O C 11 N.HC1

Still another method consists of reacting one mol of an aliphatic amine of at least 5 carbon atoms, an aromatic amine, or a heterocycllc amine, with one mol of an aromatic l-hydroxy- Z-carboxylic acid chloride in the presence of a solvent-diluent at a temperature ranging from 0 C. to 30 0., heating to reflux temperature for 7 amino52-dodecyl-aminobenzene -i 3 isulfonlc .",acid ,j 7 p-Stearylaminaniline. j

o-Methyl-dodecylaminoaniline p-Dodecylaminotoluidine 4-methyloctadecylamino-l-naphthylamine 4-methyloctadecylainino-l-aminoearbazole 4 methylo'ctadecylamino 1-amino-2-ethoxybenzene i.

p-Stearylamin'o-1--meth'oxyaniline The last 7 compounds maybe prepared by re:- acting the corresponding nitrochlorbenzenes with aliphatic amines. Instead of these diainines there may be employed aromatic amines, the nucleus of..which has directly attached thereto by means of a homopolar linkage; i. e;, 'C'(3---, -o-- o-, CONI I-, N co or --NH-- linkage at leastone carbon chain havingvmore than five carbon atoms in the. form of -hydrocarbon radicals. Such amines are, for example, 0- and p-octadecylaniline or the octadecyl ether of p-aminophenol;;:p-stearoylaminoaniline, pdecylcarbamylaniline, p dodecylaminoaniline, and the like. a V 1 we Heterocyclic amines 'u-A'minofuran, p-Aminofuranj Fur'furylamine 3-amino-5-pyrazolone 2-aminoindole 3-aminoindole a-Aminopyrrole j fl-Aminopyrrole 1-phenyl-3+amino-5-pyrazolone r 1(2' benzothiazolyl) 3 amino-5=pyrazolone* fi-aminobenzthiazole 1 T 6-aminobenzoxazol Instead of a tertiary nitrogenousbase as a solvent-diluent, there may;be useda' cyclic hydrocarbon such as, 1 for example," :cyclohexane, cycloheptane, cyclooctaneflbenzene; toluene, omana idxylene, ethylbenzene, 1.2.4-trimethylbenzene, propyl-benzene, 1.3:ethyl-methylbenzene, and the like, containing an. :acid-- acceptor such as one of the nitrogenousbases hereinbefore listed, a sludge or suspension of sodium carbonate, and the like. Similarly, the solvent-diluent may ,be-iacetic acid, glacial acetic acid,-1or,the like, con-. taining an acid acceptor.

Of these various classes of solvent-diluents, pyridine or a pyridine-benzene mixture isiprei'erred. 7 It is :to be noted, however, that solvent diluents -other than those mentioned above may also beremployed, the selection depending more or lesson the resistance of the selected solventdiluent to reaction with the coereactants. V

c In the illustrations given. above, it has been stated that the;oxazinediones -be isolatedby crystallization from an alcohol. Other methods, however, may. be resorted to in order to obtain .such compounds in a highly purified condition.

For example, after removing the solvent-diluent,

the residue is treated with sodium chloride solu- .tion,'resludged in cold. water, filtered; and the solid washed and dried. Or after removal: of the solvent-diluent,- the precipitate is sludged with acetic or glacial acetic acid, filtered, washed and dried. w i H 7 It has been stated that in Formula-2 there may be an acid group such as sulionic acid, carboxylic acid, or the like. If .itv be desiredto isolate such oxazine diones in the form of theiralkali metal 8 salts o 's heaci s-bthe a i dio e. a te re! moval of'the sclvent-diluennis dissolved man alcohol such as methanoL- ethanol, and the like, filtered andythe oxazine dione precipitated by adding a: solution of :an' alkali metal hydroxide, i. e., sodium hydroxide, potassium-hydroxide in an alcoholas labove, or--in aqueous alcohol. --"I{he. compounds prepared in accordance with the'presentinvention, when employed as color-1 formers may be added to the developenprovided they are not-fast to diffusion-in gelatin, .or to. the silver-halide.emulsion'in'theLform of a solution or a suspension in a suitable 'solvent, suchv aslN-alcoholic sodium or potassium hydroxide, acetone, ethyl alcohol, isopropyl alcohol, etc. Dispersing agents such as isopropyl naphthalene. sulfonic acid or any of the dispersing agentsf disclosed in United States Patent 2,186,717 may; be used in preparing the suspension of the waterinsoluble color-formers for incorporation into developers or silver-halide emulsions. Instead of gelatin, the compounds may be incorporated in other colloidal materials such as, organic esters of cellulose, polyamides, polyesters or synthetic resins. The emulsion may be carried by a transparent medium such as cellulose esters, superpolyamides, synthetic resins or a non-transparent reflecting medium such as paper, or anopaque cellulose ester. The emulsion may be coated as a single layer on the support, or superposed layers containing the compounds may be coated on one or both sides of the support. The superposed layers may be differentially sensitized for the formation of a color image in the well-known manner. The compounds which are not fast to diffusion in gelatin as where R1 of the general Formula 2 is a short chain aliphatic hydrocarbon, or an aromatic'or heterocyclic group not carrying a radical producing fastness to difiusion, immediately hydrolyze upon addition to the developer and form an aromatic 1-hydroxy-2-acid amide color-former capable of yielding dyestull images of satisfactory colorden'sity and purity; On the other hand, the compounds which are fast to diffusion in gelatin as where R1 ot the general Formula 2 is a long chain aliphatic hydrocarbon, or an aromatic or heterocyclic group carrying a radical producing fastness to difiusion, immediately hydrolyze when dissolved or suspended in lN-alcoholic sodium or potassium hydroxide or other basic media, prior to incorporation into a silver-halide emulsion, and form an aromatic l-hydroxy-2-acid amide color-former ofsatisiactor'y Purity; l. As'ex'amples of suitable aromaticprimary amino developing agents which may be employed with thecolor"coupling'compounds of the present invention, there may be mentioned p-phenylene fdiamine',.mono' ethyl-p-phenylene diamine, diethyl-o-phenylene diamine, 4A'rdiamine-diphene ylamine, pkamino-dialkyl aniline, e. g., p-aminodimethyl aniline 'ial'ld p-amino-diethyl aniline. These developing agents :are; preferably used in the form of. their'salts-suchas the hydrochloride, since they are more' soluble and stablethan the free base; Theyjare characterized by the pres 'ence or a free or primary amino group "in the 'phen'ylnucleus which enables the oxidation prod? "uct of the'develbpeifto couple with'the colorformer to form adye'i'mage of the quin'oli'ne-imine or azomethine; type in the emulsion adjacent to the individualparticles of the silver image, The silver image may be removedby bleaching'inthe well-known manner to leave the color image: in

the emulsion; p

A l-surtable developmgi isolutiom prepared= as follows :a

pafimino diethylaniline HGI 2.0 Sodium.carbonate lanhydrouwn 50.0: Sodiumrsulnte (anhydrous-):; as---" an Potassium bromide.-- 0.2

Water to make: 1*. liter:-

The exposed silver-halide-emulsionsare-devel oped in the above 'solutiorrin the usual-manner? A "solution of the *color fonnerisbn'ly added? to the "developing solution where the c'oloi' -former' is not fast to difl'usion andisnotpreserrt-inthe silver -halide' emulsion".

The followingexa-mples are intended to 'illus trate the preparation of compounds =-ofth"egenera'l Formula 21* It-wiiT be-appreciatedthatthe conditionsor-reaictions, e; "g.,' proportion of 'reacti'ngingredients; times of reaction; and tempera: ture; may b'e varied and that'suppleinentary pron-=- esses of purification,- and' the like; may be resorted to wherever foundvdesirable:.= These and other variations and modifications will be evident to those skilled in the art in light of the guiding principles disclosed herein.

Example?! soinio mlw To a 'sol'ution=*of-"l6i "grams 6;3 56 'molof 3'- amino-5-stearoylamino p-toluenesulfonic acid- 1 'cc. of pyridine are -addieddufing a period of one-half hour at O- 'IU 62, 10a? grams li'.384 rnol9 of "1 -carbethoxyoxy-flhaplithyl chloride? The reaction mixture is stirred an additionaP one l'ialt Resolution of rr 'ramsxm mol) of 3-amin'o-5 stearoyl'amino -ptolnenesulfonic acid in 350" 'cc. l 'yridi'ne and S5 cc' ofibe'r-lzene 'is'distilled at at-'- mospheric pressure'untii about 100 cc of" distillate been collected to insure dryness. Thereis a'd'ded'inoneportion at' 0*"6. 28 grams (0.1% mol) of 42@hlbid E-hydhoxyQ naplithoyl ohlo ride. The" mixture is refluxed for three hours, and then: at 0 1 8i? grains (0.168 mol) of ethyl chloroformate are add'ed during one-half hour. The solution is agai rr heatedat-reflux for three hours, and the" solvent removed at reduced pressure. Theresidue i's' dissolved in 450 cc. hot methanol, filtered t clarify;"and chilled. The produce, 71 gramsyiscollected by filtration, and may be recrystallized from organic solvents.

1.8 grams of the above color-former are dissolved in 2.0 cc. of IN-alcoholic KOH and added with thorough mixing to 100 cc. of a gelatin silver bromide-iodide emulsion. After coating the emulsion containing thecolor=formeronto a suitable support and drying, the film was exposed and developed to' yield a cya-n image of satisfactory color density and purity.

Example IV From-a mixturevofi 47 grams (0 .1- mol) of amino-5-stearoylamino-pv-toluenesulfonic acid; in 5061mm of benzene-and cc. of pyridine there aredistilled; ccnoil solvent 'to insure dryness. There are addedatfi G: 28.5 gramsl-Ol mol) of -bromo-L-hydroxy-2enaphthoylr chloride. The reactiom mixture --is ==reflnxed for three. hours, ceoledaandl there are added ate 0. during onehairv hour "1-8 .2 grams-6.0. 1.68-- mol) ofi ethyl chloroformate. Following an: --alzlrliiaion-althreehours at reflux temperature the solvent is removed at reduced pressure, and thecooled residue sludged with 200 cc. of methanol, filtered, and recrystallized from 1200 cm or methanol. yielding 38.1 grams of vacuum .dried product.

1.8 gramsofthe'above color-former are dissolved in 2.0 cc; of liN alcoholicz KOH and added with thorough mixing to "100, cc. of a gelatin silver bromide iodide emulsion. After coating the emulsion containing the;eolor-former onto a Suitable support and drying, the film was exposed and developed to yield a cyan image of satisfactory color density and purity.

Example V 0 11. CsHsN There are suspended 15.37 grams (0.025 mol) of l-hydroxy-N-octadecyl-2-naphthamide-4-sulfonic acid as its pyridine salt in '77 cc. of pyridine. During one hour there are added at C., grams (0.031 mol) of ethyl chloroformate. The reaction mixture is then held at 0-5 C. for onehalf hour; 30-40" C. for one-half hour; 60-70 C. for one-half hour, and at 115 C. for one-half hour. The solvent is removed at reduced pressure, and the residue emulsified at 40 C. in 128 cc. of water. The product is coagulated by pouring it into 153 cc. of 20% sodium chloride solution, filtered, and resludged in cold water, yielding 12.8 grams of vacuum dried product. 1.8 grams of the above color-former are dissolved in 2.0 cc. of lN-alcoholic KOH and added with thorough mixing to 100 cc. of a gelatin silver bromide-iodide emulsion. After coating the emulsion containing the color-former onto a suitable support and drying, the film was exposed and developed to yield a cyan image of satisfactory color density and purity.

Example 3 CH3 0 (3 711350 ONH- N-(fi- OH;

. OaK

A solution of 4'7 grams (0.1 mol) of 3-amino-5- stearoyl-amino-p-toluenesulfonic acid in 245 cc. of pyridine at 0 C. is added to a cold solution of 36.4 grams (0.15 mol) of 2-0arbethoXYoxy-3- cresotinoyl chloride and 100 cc. of pyridine. Following three hours of reflux, the solvent is removed at reduced pressure and the residue dissolved in 200 cc. of methanol. After filtration to clarify, the product is precipitated from the filtrate by adding a solution of grams of potassium hydroxide in 50 cc. of 50% methanol, and 38.5 grams collected through filtration.

1.8 grams of the above color-former are dissolved in 2.0 cc. of lN-alcoholic KOI-I and added with thorough mixing to 100cc. of a gelatin silver bromide-iodide emulsion. After coating the emulsion containing the color-former onto a suitable support and drying, the film was exposed and developed to yield a cyan image of satisfactory color density and purity.

Example VII r r CHEM- I 0-? -S O H A31 The are'added at 5 C., 2'? grams (0.112 mol) of 4-chloro-l-hydroxy-Z-naphthoyl chloride to a suspension of 46 grams of (0.096 mol) 3-amino- 4-methyloctadecyla mino benzene sodium sul'zfona te in 500 cc. of pyridine. The mixture is slowly heated to reflux, and maintained at that temperature for one hour. Upon cooling to 5 0., there are added during one-half hour 20 grams (0.184 mol) of ethyl chloroformate, and the mixture again refluxed for one-half hour. Upon cooling to 60 C., there are added 500 cc. of methanol, the solution chilled, and 4'7 grams. of product collected by filtration.

1.8 grams of the above color-former are dissolved in 2.0 cc.- of 1N-alcoholi1c KOH and added with thorough mixing to cc. of a gelatin silver bromide-iodide emulsion. After coating the emulsion containing the color-former onto a suitable support and drying, the film was exposed and developed to yield a cyan image of satisfactory color density and purity.

Example VIII A solution of 9.7 grams (0.1 mol) of furfniry-lamine in cc. of pyridine at 0 C., is added to a cold solution of 36 grams (0.15 mol) of 2-carbethoxyoxy-3-cresotinoyl chloride in 100 cc. of pyridine. Following three hours of reflux, the solvent is removed at reduced pressure and the residue dissolved with warming in 200 cc. of methanol. After filtration to clarify, the filtrate is cooled, the precipitate filtered off and recrystallized from methanol, yielding 25 grams of crystalline product.

One gram of the above product is dissolved in 20 cc. of ethyl alcohol. 'Ilwo cc. of the solution are then added to the developing solution and used for the development of an exposed silverhalide emulsion. A cyan dyestuff image of high intensity and brilliance 'was obtained.

The oxazine diones of the present case are novel products and. this applies particularly to those products in which the N-atom of the oxazine ring is substituted by a radical containing an aliphatic hydrocarbon chain of at least 5 carbon atoms, .and the nucleus to which said ring is fused is .a naphthalene nucleus. Such compounds are those which yield amides most efiective as color-formers for use in silver-halide emulsions. Said compounds may be typified by the formula:

in which Ar is a phenyl radical, X is of the same value as above, Y is a homopolar linkage such as,

like, and R4 is an aliphatic hydrocarbon radical containing at least 5 carbon atoms.

While we have disclosed the preferred embodiments of our invention and the preferred modes oi carrying the same into effect, it will be the iscone of our.;invention-:is to: :be

Y readilyhappm'cnt to-iithose slsillcdxinithetant that mannwariations may: :be,.-m1ade:itherein witkmut departmgzfmmz-therspiritr thereo Accordingly;

limited; solely oo-ut wherein i R, i's an alkyl group, RP- represents" a member selected from the clas'sconsisting of an aliphatic radicar-of-at'least carbonatomsammatic and heterocyclic radicals, R2 and R3 are members selectedgfrommhe class consisting of hydrogen, alkyl and together the atoms necessary to .completeian aryl ringstructure, and X is a member selected from the :class consisting of hydrogen, halogen, and an acid radical, and alkali salts of saidacid radical;'to efiect ring closure with eliminationcb anwalcohol, removing the solvent-diluent and recovering. an .oxazine dione readily convertible to said amides by alkali hydrolys'is, said oxazine dioe having the following general formula: r

wherein R1, R2, R3, and X-have the same values as above.

2. In a process ofgpurifying anxamide of the formula: i

the improvement which comprises heating in a solvent-diluent capable of acting as an acid binding agent a compound of the formula:

SO3H.C5H5N wherein R is an alkyl group, to effect ring closure I14 withetnliminationvmf :am iialcohola: removingirtbh solvent-diluent and recovering an oxazine'idiono readily convertible to said amide by alkali hydrolysis, said oxa zinergdione having the following formula:

CnHasC ONH- HatCh'HNGQ' thex-improvementgwhich. icomprisesiheating inra solvent-diluent capableofactingiasau acid binding agent; a compound of the formula:

1 o a d-(5 LinoleumwhereimRaiszanalkalremumrtoeficct ringzclosure with elimination riofi..;.anz alcohohi mirroring; the solrentrrdilnent and irecoyeringmnxoxazine; dione readilyaconvertiblextcz-ssaidr amidehbuialkaliihye drolysis, said aoxazinegdioncc haningizthe followin ate is oinomm 4. In a process of=-=purifying -an' amide of the formula: 1

F? I a new: v

the improvement which comprises heating in a solvent-diluent capable of acting as an acid binding agent a compound of the formula:

wherein R is an alkyl group, to efiect ring closure with elimination of an alcohol, removing the solvent-diluent and recovering an oxazine dione readily convertible to said amide by alkali hy- 1'5 7 137518; said .OXaZiIIGadi ne havin .th' w formulazw 5. The process according to claim 1 wherein the so1vent-di1uentis a tertiary nitrogenous base.

6. The process according to claim 2 where the solvent-diluent is pyridine.

7. The process according to claim 3 where "solvent-diluent is pyridine. r

8. The process according to claim 4 where 'the solvent-diluent is pyridine.

9. The process according to claim 1 wherein the oxazine dione is subjected to alkali hydrolysis.

10. The process according to claim 2 wherein the oxazine dione is subjected to alkali hydrolysis.

11. The process according to claim 3 wherein the oxazine dione is subjected to alkali hydrolysis.

12. The process according to claim 4 wherein the oxazine dione is subjected to alkalihydrolysis.

1'3. Compounds of the' formula:

the

wherein Ar is a phenyl radical, Y is a homopolar linkage selected from the class consisting of C--C, C-'-O-C-, CONH--, NHCO.

16 and NH-"-'linkages, R; "and Ba are members "selected from the classconsistingpf' hydrogen, alkyl, and together the atoms necessary to complete an aryl ring structure, R4 is an aliphatic hydrocarbon group of at "least 5 carbon atoms,

and X is a member selected from the class consisting of hydrogen, halogen, an acid radical an alkali salts of said acid radical.

15. Compounds of the formula:

wherein R2 and R3 are members selected from the class consisting of hydrogen, alkyl, and together the atoms necessary to complete an aryl ring structure, R4 is an aliphatic hydrocarbon group of at least 5 carbon atoms, and X is a member selected from the class consisting of hydrogemhalogen, an acid radical and alkali salts of. said acid radical.

16. A compound of theformula:

. o 5 on. tt o GnHuC ON H- I V e somorn N- l7. Acompound of the formula:

alCil-NC SOEH-CSHIN 18. A compound of the formula:

0 II c0 HC--CH I! ll H o o% -e- CH: 0

PAUL NAWIASKY. LESLIEMMIILARD ,SCHENCK. ISAAC GLENN STEVENSON.

No references cited. 

